A diaphragm coupling is a high-performance, metal elastic coupling that transmits torque and accommodates shaft misalignment through the elastic deformation of thin metal diaphragms. It is widely used in high-speed, high-precision, and heavy-duty power transmission systems.

Basic Structure

It mainly consists of:

Driver hub & driven hub

Diaphragm pack (stack of thin stainless steel plates)

Rivet / bolt assembly

Torque is transmitted from the driving hub to the diaphragm pack, then to the driven hub.

Working Principle

Diaphragm couplings rely on controlled elastic deformation of metal diaphragms to compensate for:

Angular misalignment

Radial misalignment

Axial misalignment

Combined misalignment

They operate without backlash and without friction or sliding parts.

Key Features & Advantages

Zero backlash: Ideal for servo systems, precision machinery

High torsional stiffness: Stable at high speeds

Wide temperature resistance: Suitable for high‑temp and low‑temp environments

No lubrication required: Maintenance‑free

Long service life: No wear parts

Good balance performance: For high‑speed rotating equipment

Corrosion resistance: Usually stainless steel diaphragms

Typical Applications

Compressors, fans, blowers

Pumps, centrifuges

Turbines and generators

Servo motors, machine tools

Marine propulsion systems

High‑speed gear units